CN115173871A - Carrier suppression circuit and suppression method for spectrum shifting circuit - Google Patents
Carrier suppression circuit and suppression method for spectrum shifting circuit Download PDFInfo
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- CN115173871A CN115173871A CN202210785940.0A CN202210785940A CN115173871A CN 115173871 A CN115173871 A CN 115173871A CN 202210785940 A CN202210785940 A CN 202210785940A CN 115173871 A CN115173871 A CN 115173871A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
- H04B1/0082—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band
- H04B1/0085—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band where one band is the image frequency band of the other and the band selection is done by image rejection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
- H04B1/0017—Digital filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
Abstract
The invention discloses a carrier suppression circuit and a suppression method of a frequency spectrum shifting circuit, and relates to the technical field of carrier communication transmission. The invention carries out non-analog filtering suppression on the local oscillator LO leaked in the output local oscillator signal after the frequency spectrum is shifted, thereby achieving higher carrier suppression in the output radio frequency RF signal; when the local oscillation frequency point is switched and changed, the influence of frequency change is avoided; correspondingly compensating the temperature to reduce the sensitivity of the temperature; the signal bandwidth is further widened within the existing technical capacity range, and the performance is improved.
Description
Technical Field
The present invention relates to the field of carrier communication transmission technologies, and in particular, to a carrier suppression circuit and a suppression method for a spectrum shifting circuit.
Background
Modern communication technology has leap forward, but the spectrum shifting process of analog signals still cannot be left. Carrier communication transmissions are essentially the modulation of voice or other information into a higher carrier frequency band for long distance transmission. Where the modulated voice or other information is referred to as an intermediate frequency (baseband signal) IF, the local carrier signal is referred to as a local oscillator signal LO, and the transmitted signal is referred to as a radio frequency signal RF. With the development of device technology capability, the volumes of various components have been greatly reduced, and various multifunctional integrated circuits are continuously emerging. However, due to non-linearity during the spectrum shifting, there are unwanted local oscillator LO leakage and other spurious signals in the output rf signal. Therefore, various analog filters are designed to perform frequency selection and clutter suppression, and digital filters are not used in rf bands with higher frequencies.
Meanwhile, according to the frequency mixing principle, when the intermediate frequency (baseband signal) IF signal frequency is low, the frequency of the output RF and the local oscillator LO are closely spaced, and only IF (in a certain bandwidth, the lowest frequency of IF) is spaced closely. The output RF signal after the frequency spectrum shifting contains a local oscillator LO signal with a large amplitude. Due to the order limitation and the limited rectangular coefficient of the analog filter, it is difficult to achieve good suppression or even no suppression on the LO signal, so that effective transmission cannot be achieved. The intermediate frequency (baseband signal) IF of the actual communication system is relatively high. Such as the usual intermediate frequencies 70mhz,140mhz, etc.
These filters are of a wide variety, mainly lumped parameter LC, SAW, FBAR, dielectric, cavity, microstrip, etc. versions. Without exception, on one hand, these filters are relatively large in size, and on the other hand, the local oscillator LO signal often needs to be adjusted, so that the system operating frequency band may be changed, at this time, the original rf filter may lose the suppression effect, and the filter is switched and selected (switched filter bank), so that the number of filters is increased, and in short, the integration is not easy to perform.
In a communication system of an instantaneous large bandwidth, the upper frequency limit of the intermediate frequency (baseband signal) IF is limited due to device performance limitations. Furthermore, the filter for a large instantaneous bandwidth signal has a wider bandwidth, so that the suppression of the local oscillator LO becomes more difficult, i.e. the lower frequency limit of the intermediate frequency (baseband signal) IF is limited. This results in a limited bandwidth of the intermediate frequency (baseband signal) IF. The foreign technology level is high, and the upper limit can be improved through the device and chip capability, but the general technology level of China is limited, and the upper limit is relatively low, so the signal bandwidth is limited.
One of the spectrum shifting circuits is an image rejection mixer circuit (image rejection mixer). The principle is that quadrature power division (phase difference is 90 degrees) is carried out on intermediate frequency (baseband signal) IF, and then the IF and a mixer with two theoretical same performances are mixed, wherein two local oscillator signals are also in quadrature (phase difference is 90 degrees). The single-sideband mixing is finally realized by the mixing output signal, wherein the leakage of two local oscillation signals can also obtain a certain offset effect because of phase deviation, but the circuit is rarely applied in reality, and the corresponding mixer varieties are also few.
Meanwhile, the frequency spectrum shifting circuit is also influenced by temperature change, the amplitude of the local oscillator signal LO1 leaked at different temperatures is different, and the bandwidth of the analog filter is also changed. In order to ensure the operation of the full temperature region, the actual bandwidth of the analog filter is much wider than the signal bandwidth due to other considerations such as group delay, and the lowest frequency of the intermediate frequency (baseband signal) IF is required to be as high as possible to ensure a certain suppression capability.
The summary is as follows: the frequency spectrum shifting process is affected by nonlinearity, the leakage of the local oscillator signal LO is contained in the mixing output radio frequency signal RF, the interval of the useful radio frequency signal within the frequency distance is related to the lowest frequency of the intermediate frequency (baseband signal) IF, and the lower the IF frequency is. Meanwhile, the analog filter is limited by the process, the technical level and the like, the size is relatively large, and the single filter is difficult to adapt to and meet the application of the local oscillation frequency LO needing to be changed. In turn, the existing conditions and solutions constrain the frequency range of the intermediate frequency (baseband signal) IF and require that its lowest frequency be as high as possible.
In view of the above-mentioned shortcomings, we propose a spectrum shifting circuit carrier suppression circuit and suppression method.
Disclosure of Invention
The present invention is directed to a carrier suppression circuit and a suppression method for a spectrum shifting circuit to solve the above-mentioned problems.
In order to achieve the purpose, the invention adopts the technical scheme that: the carrier suppression circuit of the frequency spectrum shifting circuit comprises a frequency mixer, a combiner and a suppression module, wherein the suppression module consists of amplitude amplification attenuation, phase shift control and temperature detection, the frequency spectrum shifting circuit injects a local oscillation signal LO through a local oscillation port of the frequency mixer, an intermediate frequency (baseband) signal IF outputs LO-IF signals and LO + IF signals under the action of the local oscillation signal, and a leakage local oscillation LO1 output due to insufficient isolation of the frequency mixer, the suppression module performs signal combination with a radio frequency RF output by the frequency mixer after amplitude amplification attenuation and phase shift control on an opposite phase signal of the local oscillation signal LO, the amplitude of the LO signal before combination is the same as the amplitude of the leakage local oscillation LO1 in the local oscillation RF signal output by the frequency mixer, the phases of the LO signal are opposite, so that the leakage local oscillation 1 in the radio frequency signal RF output after combination is counteracted to form a direct current, and the temperature detection is used for detecting the working temperature of the frequency spectrum shifting circuit and performing temperature compensation according to the temperature and amplitude phase characteristics of each frequency.
Preferably, the output radio frequency signal RF of the mixer at least includes three signals of LO-IF, LO1 and LO + IF, the useful radio frequency RF is LO-IF, that is, the lower sideband is mixed, the useful radio frequency RF is LO + IF, that is, the upper sideband is mixed, and the leakage local oscillator LO1 signal and the useful signal are separated by IF.
Preferably, the frequencies of the different local oscillators LO are different, the amplitudes and phases of the leaked local oscillators LO1 after frequency mixing are not completely the same, the amplitudes of the local oscillator signals LO and the local oscillator leakage signals LO1 are equivalent through the amplitude amplification and attenuation, and the phases of the local oscillator signals LO and the local oscillator leakage signals LO1 are opposite through the phase shift control.
Preferably, the phase shift control is a phase shifter, and the temperature detection is a temperature sensor.
Preferably, the amplitude and phase adjusted local oscillator LO and the leakage signal LO1 are combined in a combiner to cancel the amplitude and the phase.
The suppression method of the carrier suppression circuit of the frequency spectrum shifting circuit comprises the following steps:
step1: when a carrier suppression circuit of a frequency spectrum moving circuit is electrified for working for the first time, firstly identifying the local oscillation frequency when the circuit works, then reading the temperature parameter of a temperature sensor, respectively adjusting the amplitude and phase parameters by taking the local oscillation frequency and the temperature parameter as the reference, and adjusting the amplitude deviation and the phase deviation of two local oscillation signals entering a combining circuit, wherein the amplitudes are completely the same in principle, and the phase deviation is completely counteracted when the phase difference is 180 degrees, but in engineering application, some deviation is allowed, and the final carrier cancellation result is based on meeting the index requirement;
step2: when the amplitude or phase parameter is adjusted to output a carrier suppression result to meet the requirement, storing the current local oscillation frequency, temperature and amplitude and phase parameters;
step3: if the circuit works only one local oscillator, the adjustment is finished at the moment, if a plurality of local oscillator signals exist, the local oscillator frequency is changed, then the amplitude-phase parameter is adjusted until the output carrier suppression result meets the requirement according to the current temperature parameter, and new local oscillator frequency, temperature, amplitude and phase parameters are stored;
step4: under different working temperature conditions and also under the conditions of local oscillator frequencies, amplitude and phase parameters are adjusted by combining the temperature parameters, and then the local oscillator frequencies, the temperatures, the amplitudes and the phase parameters are stored;
step5: and then directly calling corresponding amplitude and phase control parameters according to the local oscillation frequency and the temperature parameters.
The invention has the following beneficial effects:
the invention adopts a processing method related to the amplitude and the phase of the local oscillation signal LO per se for inhibiting the leakage local oscillation LO1 signal in the frequency spectrum shifting circuit, and is not related to other signals, and meanwhile, the local oscillation signal LO is a relatively stable signal when equipment or a system works, and most of the local oscillation signals LO are continuous single-carrier signals, so that the amplitude and the phase can be easily adjusted.
When the local oscillation frequency point is switched and changed, the corresponding amplitude attenuator and the phase shifter can be adjusted in a preset mode, so that the result is not influenced by frequency change.
The invention adopts the temperature sensor to detect the temperature, and correspondingly carries out temperature compensation, thereby reducing the sensitivity of the temperature.
The invention reduces the number of radio frequency filters under certain conditions, simultaneously reduces the constraint on the frequency range of intermediate frequency (baseband signal) IF, particularly the lower limit frequency, can further widen the signal bandwidth within the prior technical capability range, and realizes the performance improvement.
Drawings
FIG. 1 is a schematic circuit diagram of a carrier suppression circuit of the spectrum shifting circuit according to the present invention;
FIG. 2 is a flow chart of a method for suppressing a carrier suppression circuit of a spectrum shifting circuit according to the present invention;
fig. 3 is a schematic diagram of a typical conventional spectrum shifting circuit.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The first embodiment is as follows:
please refer to fig. 1: the carrier suppression circuit of the frequency spectrum shifting circuit comprises a frequency mixer, a combiner and a suppression module, wherein the suppression module consists of amplitude amplification attenuation, phase shift control and temperature detection, the frequency spectrum shifting circuit injects a local oscillation signal LO through a local oscillation port of the frequency mixer, an intermediate frequency (baseband) signal IF outputs LO-IF signals, LO + IF signals and leakage local oscillation LO1 output due to insufficient isolation of the frequency mixer under the action of the local oscillation signal, the suppression module performs signal combination with radio frequency RF output by the frequency mixer after amplitude amplification attenuation and phase shift control on an inverted signal of the local oscillation signal LO, the amplitude of the local oscillation signal LO before combination is enabled to be the same as the amplitude of the leakage local oscillation LO1 in the RF output by the frequency mixer through amplitude amplification attenuation and phase shift control, phases are opposite to each other, so that the leakage local oscillation LO1 in the radio frequency RF output after combination is offset to form direct current, a radio frequency filter is isolated and filtered through a blocking capacitor to form direct current by the leakage local oscillation LO1, and the temperature detection is used for detecting the temperature when the frequency spectrum shifting circuit works and performing temperature compensation according to the temperature compensation of each frequency point.
The output radio frequency signal RF of the mixer at least comprises three signals of LO-IF, LO1 and LO + IF, the useful radio frequency RF takes the LO-IF as the lower sideband frequency mixing, the useful radio frequency RF takes the LO + IF as the upper sideband frequency mixing, and the leakage local oscillator LO1 signal is separated from the useful signal by IF.
Wherein, different local oscillator LO frequencies are different, the local oscillator LO1 range and the phase place of leaking after the mixing are also not identical, make local oscillator signal LO and local oscillator leakage signal LO 1's range equal through the range amplification attenuation, realize local oscillator signal LO and local oscillator leakage signal LO 1's phase place is opposite through the control of shifting the phase, because the amplitude variation that local oscillator frequency variation brought is relatively less in the actual circuit, general amplitude attenuation can accomplish more than 20dB, and the phase place mainly is the change that the different wavelength of frequency arouses, the phase shifter can accomplish 360 and shift the phase, can realize completely through current device level.
The amplitude amplification attenuation is specifically an amplitude attenuator, the phase shift control is specifically a phase shifter, and the temperature detection is specifically a temperature sensor.
The local oscillator LO after amplitude and phase adjustment is combined with the leakage signal LO1 in the combiner to offset the amplitude and phase.
In the invention, the suppression of the leakage local oscillation LO1 signal in the frequency spectrum shift circuit adopts a processing method related to the amplitude and the phase of the local oscillation LO, and is unrelated to other signals, and meanwhile, the local oscillation LO is a relatively stable signal when equipment or a system works, and most of the local oscillation signals are continuous single-carrier signals, so that the amplitude and the phase are easily adjusted.
It should be noted that the drawings only illustrate the basic idea of the present invention in a schematic manner, and each component needs to be adjusted or modified according to actual conditions in actual circuit design.
Example two:
please refer to fig. 2: the suppression method of the carrier suppression circuit of the frequency spectrum shifting circuit comprises the following steps:
step1: when a carrier suppression circuit of a frequency spectrum shifting circuit is powered on for work for the first time, the local oscillation frequency when the circuit works is identified, then the temperature parameter of a temperature sensor is read, the local oscillation frequency and the temperature parameter are taken as references, the amplitude parameter and the phase parameter are respectively adjusted, the amplitude deviation and the phase deviation of two local oscillation signals entering a circuit to be combined are adjusted, the amplitudes are completely the same in principle, the phases are completely offset when the phase difference is 180 degrees, but in engineering application, some deviations are allowed, and the final carrier offset result is based on meeting the index requirement;
step2: when the amplitude or phase parameter is adjusted to output a carrier suppression result to meet the requirement, storing the current local oscillation frequency, temperature and amplitude and phase parameters;
step3: if the circuit works only one local oscillator, the adjustment is finished at the moment, if a plurality of local oscillator signals exist, the local oscillator frequency is changed, then the amplitude-phase parameter is adjusted until the output carrier suppression result meets the requirement according to the current temperature parameter, and new local oscillator frequency, temperature, amplitude and phase parameters are stored;
step4: under different working temperature conditions, and also under the conditions of local oscillation frequencies, adjusting amplitude-phase parameters by combining temperature parameters, and then storing the local oscillation frequencies, the temperatures, the amplitude and the phase parameters;
step5: and then directly calling corresponding amplitude and phase control parameters according to the local oscillation frequency and the temperature parameters.
In the invention, when the local oscillation frequency point is switched and changed, the corresponding amplitude attenuator and the phase shifter can be adjusted in a preset mode, so that the result is not influenced by frequency change.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The carrier suppression circuit of the frequency spectrum shifting circuit is characterized in that: the carrier suppression circuit of the frequency spectrum shifting circuit comprises a frequency mixer, a combiner and a suppression module, wherein the suppression module consists of amplitude amplification attenuation, phase shift control and temperature detection, the frequency spectrum shifting circuit injects a local oscillation signal LO through a local oscillation port of the frequency mixer, an intermediate frequency (baseband) signal IF outputs an LO-IF signal, an LO + IF signal under the action of the local oscillation signal, and a leakage local oscillation LO1 caused by insufficient isolation of the frequency mixer is output, the suppression module takes an inverted signal of the local oscillation signal LO to perform signal combination with a radio frequency RF output by the frequency mixer after amplitude amplification attenuation and phase shift control, the amplitude of the local oscillation signal LO before combination is the same as the amplitude of the leakage local oscillation LO1 in the RF signal output by the frequency mixer through amplitude amplification attenuation and phase shift control, the phase is inverted, the leakage local oscillation LO1 in the radio frequency signal RF output after combination is mutually offset to form a direct current, and the temperature detection is used for detecting the working temperature of the frequency spectrum shifting circuit and performing compensation according to the temperature and amplitude-phase characteristics of each frequency point.
2. The spectrum shifting circuit carrier suppression circuit according to claim 1, wherein: the output radio frequency signals RF of the frequency mixer at least comprise three signals of LO-IF, LO1 and LO + IF, the useful radio frequency signals RF adopt the LO-IF to form lower sideband frequency mixing, the useful radio frequency signals RF adopt the LO + IF to form upper sideband frequency mixing, and the leakage local oscillator LO1 signals are separated from the useful signals by IF.
3. The carrier suppression circuit for a spectrum shifting circuit according to claim 1, characterized in that: different local oscillator LO frequencies are different, the amplitude and phase of the leaked local oscillator LO1 after frequency mixing are not completely the same, the amplitude of the local oscillator LO and the amplitude of the local oscillator leakage signal LO1 are equivalent through the amplitude amplification and attenuation, and the phase reversal of the local oscillator LO and the local oscillator leakage signal LO1 is realized through the phase shift control.
4. The carrier suppression circuit for a spectrum shifting circuit according to claim 1, characterized in that: the amplitude amplification attenuation is specifically an amplitude attenuator, the phase shift control is specifically a phase shifter, and the temperature detection is specifically a temperature sensor.
5. The method for suppressing the carrier wave suppression circuit of the spectrum shifting circuit according to claims 1 to 4, characterized by comprising the steps of:
step1: when a carrier suppression circuit of a frequency spectrum shifting circuit is powered on for work for the first time, the local oscillation frequency when the circuit works is identified, then the temperature parameter of a temperature sensor is read, the local oscillation frequency and the temperature parameter are taken as references, the amplitude parameter and the phase parameter are respectively adjusted, the amplitude deviation and the phase deviation of two local oscillation signals entering a circuit to be combined are adjusted, the amplitudes are completely the same in principle, the phases are completely offset when the phase difference is 180 degrees, but in engineering application, some deviations are allowed, and the final carrier offset result is based on meeting the index requirement;
step2: when the amplitude or phase parameter is adjusted to output a carrier suppression result meeting the requirement, storing the current local oscillation frequency, temperature, amplitude and phase parameter;
step3: if the circuit works only one local oscillator, the adjustment is finished at the moment, if a plurality of local oscillator signals exist, the local oscillator frequency is changed, then the amplitude-phase parameter is adjusted until the output carrier suppression result meets the requirement according to the current temperature parameter, and new local oscillator frequency, temperature, amplitude and phase parameters are stored;
step4: under different working temperature conditions, and also under the conditions of local oscillation frequencies, adjusting amplitude-phase parameters by combining temperature parameters, and then storing the local oscillation frequencies, the temperatures, the amplitude and the phase parameters;
step5: and then directly calling corresponding amplitude and phase control parameters according to the local oscillation frequency and the temperature parameters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210785940.0A CN115173871A (en) | 2022-07-04 | 2022-07-04 | Carrier suppression circuit and suppression method for spectrum shifting circuit |
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| CN202210785940.0A CN115173871A (en) | 2022-07-04 | 2022-07-04 | Carrier suppression circuit and suppression method for spectrum shifting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115913852A (en) * | 2022-10-26 | 2023-04-04 | 西安空间无线电技术研究所 | Novel high carrier suppression four-phase balanced modulator |
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| JP2006295287A (en) * | 2005-04-06 | 2006-10-26 | Fujitsu Ltd | Carrier sense method, and transmitter/receiver for rfid employing the same |
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